Remove stems from the silver beet. Cut banana leaves into 12 x 22cm squares. Drop banana leaves into a pan of boiling water until pliable; drain. Wrap each chicken thigh in a silver beet leaf then a banana leaf square, folding ends under to enclose.

Cook chicken on preheated grill plate or barbecue over low to medium heat, fold-side down, for 10 minutes. Turn parcels over; cook for further 10 minutes or until cooked through.